Microsoft announced the availability of Windows Vista, Office 2007 and Exchange 2007 for businesses on Nov. 30, an event company CEO Steve Ballmer said was the "biggest launch we've ever done." After delivering a media address at the Nasdaq Stock Exchange in New York to celebrate the product availability, Ballmer sat down with eWEEK Senior Editor Peter Galli to talk about why he feels this is a new day for Microsoft, developers and its customers. CNet has more.